Improvement in cannula-points for syringes



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Y Cannula Points for Syringes.V Y N0. 144,352. Patented Nov.4,1873.

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UNITED STATES PATENT OFFICE.,

EDVARD B. NIMMO, OF BROOKLYN, NEW YORK, ASSIGNOR TO SHEPARD &'

DUDLEY, OF NEW YORK CITY.

IMPROVEMENT IN CANNULA-POINTS FOR SYRNGES.

Specification forming part of Letters Patent No. 144,352, dated November4, 1873; application filed October 24, 1873.

To all whom it may concern:

Be it known that I, EDWARD B. NIMMO, of Brooklyn, county of Kings andState of New Yord, have invented certain new and useful Improvements inOannulated Points and Needles for Syringes, of which the following' is aspeeit cation:

This invention relates to cannulated points or needles for hypodermicsyringes, and other syringes employin g a point cannulated-t'. c., oftubular formation-the channel being very small and minute. It Will beunderstood that in the course of this specification the Word eanulatedrefers to a duet or channel of the above-specified character incontradistinction to the ordinary tubular discharge-nozzles ofconsiderable internal diameter, Which are not subject to thedifliculties and objectionsl heretofore encountered in the use ofcannulated points or needles, which difficulties and objections it isthe object of my invention to avoid. Oannulated points or needles havehere tofore been made 4almost invariably of steel. In exceptional casesgold has been used for this purpose; but the cost of this metal, and

its extreme liability to bend and get out of` shape, have constitutedinsuperable obstacles to any extended use of it in this connection.Steel has, therefore, been the metal heretofore generally employed, thepoint or needle of this material being, in some instances, afterwardgilded. The most serious difficulty expert enced in the use of steelpoints or needles is their liability to rust, causing the channel to beimpeded and even entirely stopped up. Unless a ne Wire be introducedthrough the orilice of the steel point or needle each time it is usedthe channel Will speedily close up, and Will then defy all efforts toopen it. The steel needle or point is thus very liable to oxidize; and,further, is often injuriously affected by the solutions that may beforced through it.

It has been my object to remove the difliculties above specified bymaking the cannulated points or needles of a material not liable tooxidize, or to be injuriously affected or acted on by the solutions orfluids that may be brought in contact with it- To this end I make saidcannulated points or needles of an alloy of aluminum and copper. Theproportions of this alloy may vary, but I have found that for my purposethe best results are obtained by combining the ingredients in theproportion of about one part of aluminum to nine parts of coppe'r. Ihecannulated points or needles are made of this material, the operation ofmanutacturingthem bein conducted in the usual Way, Well understood bythose skilled in the art, and requiring, therefor e, no detailedexplanation. his material is not oxidized by the contact of any fluidsubstances ordinarily used in syringes. It isnot even, so far as I havebeen able to ascertain, acted upon by caustic solutions or medicamentsof any klnd. Its value in the manufacture of cannulated points andneedles is, therefore, at once apparent, inasmuch as, by its use, :allthe dif-4 fieulties above specified are at once and effectually removed.'Ihe material, further, is cheap, and points or needles made of it costno more than the same articles made of steel and gilded, as heretoforecustomary.

In the manufacture of the points or needles of syringes for hypodermicor endermic injections, my invention will be found of special value andutility.

The accompanying drawing represents one 'of these needles. It will beunderstood, however, that I make no claim to the special configurationor form of the article; and it will also be understood that the form orstructure of the article may vary according to the uses for which it isintended.

What I claim, and desire to secure by Letters Patent, is

A cannulated point or needle for syringes made of an alloy of aluminumand copper, substantially as herein specied.

In testimony whereof I have hereunto signed my name this 21st day ofOctober, 1873.

` EDI/VARI) B. NIMMO. "Witnesses EDWD. W. GIFEORD, GEORGE O. SIMMONS.

